Vincent Delecroix wrote: > On 09/05/15 19:22, Travis Scrimshaw wrote: >>> A better syntax to access it from PolynomialRing (and also FreeAlgebra >>> and friends) would be >>> >>> sage: PolynomialRing(QQ, 'x', (2,2)) >>> Multivariate Polynomial Ring in x00, x01, x02, x10, x11, x12 >>> over Integer Ring >>> >>> Please tell me: >>> - if 'var_array' is useful to somebody (otherwise it will be deprecated) >>> - if it makes sense to have a feature for the above multi-indexing of >>> variables >>> >> I've used it to create arrays of variables to do a symbolic matrix >> computation. When I wrote it, I did it in as simple of a way as I could >> without having to rewrite the constructor, and as such, I only really >> considered (very) small matrices up to 10x10. With some experience using >> it, it would be better to not just use 0, 1, 2, ..., 100 but 000, 001, ..., >> 100 for each index to prevent ambiguity/collisions (i.e., the length of >> each number is the number of digits). > > Right. I already took care of this. And actually, with the current > version you also have the choice for one index > > sage: PolynomialRing(QQ, 'x', 11) > Multivariate Polynomial Ring in x0, x1, x2, x3, x4, > x5, x6, x7, x8, x9, x10 over Rational Field > > versus > > sage: PolynomialRing(QQ, 'x', (11,)) > Multivariate Polynomial Ring in x00, x01, x02, x03, > x04, x05, x06, x07, x08, x09, x10 over Rational Field > > (you would get the exact same thing by using `variable_names` directly)
I'd simply use x_i, x_i_j etc. for subscripting. -leif -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
